Strength of the d_{x^2-y^2} pairing in the two-leg Hubbard ladder

Details Strength of the d_{x^2-y^2} pairing in the two-leg Hubbard ladder Strength of the d_{x^2-y^2} pairing in the two-leg Hubbard ladder

2005-07-30

arxiv.org/abs/cond-mat/0508019v2

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.74.132503

In the ground state of the doped two-leg Hubbard ladder there are power-law decaying d_{x^2-y^2}-type pairing correlations. It is important to know the strength and the temperature scale of these correlations. For this purpose, we have performed determinantal Quantum Monte Carlo (QMC) calculations of the reducible particle-particle interaction in the Hubbard ladder. In this paper, we report on these calculations and show that, at sufficiently low temperatures, resonant particle-particle scattering takes place in the d_{x^2-y^2} pairing channel for certain values of the model parameters. The QMC data presented here indicate that the d_{x^2-y^2} pairing correlations are strong in the Hubbard ladder.

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